Rabiu Aminu K, Toth Peter S, Rodgers Andrew N J, Dryfe Robert A W
School of Chemistry University of Manchester Oxford Road Manchester M13 9PL UK.
ChemistryOpen. 2016 Dec 13;6(1):57-63. doi: 10.1002/open.201600136. eCollection 2017 Feb.
There is much interest in understanding the interfacial properties of carbon nanotubes, particularly at water/oil interfaces. Here, the adsorption of single-wall carbon nanotubes (SWCNTs) at the water/1,2-dichloroethane (DCE) interface, and the subsequent investigation of the influence of the adsorbed nanotube layer on interfacial ion transfer, is studied by using the voltammetric transfer of tetramethylammonium (TMA) and hexafluorophosphate (PF) as probe ions. The presence of the interfacial SWCNT layer significantly suppresses the transfer of both ions across the interface, with a greater degree of selectivity towards the PF ion. This effect was attributed both to the partial blocking of the interface by the SWCNTs and to the potential dependant adsorption of background electrolyte ions on the surface of the SWCNTs, as confirmed by X-ray photoelectron spectroscopy, which is caused by an electrostatic interaction between the interfacial SWCNTs and the transferring ion.
人们对理解碳纳米管的界面性质非常感兴趣，特别是在水/油界面处。在此，通过使用四甲基铵（TMA）和六氟磷酸盐（PF）作为探针离子的伏安转移，研究了单壁碳纳米管（SWCNT）在水/1,2 - 二氯乙烷（DCE）界面的吸附，以及随后对吸附的纳米管层对界面离子转移影响的研究。界面SWCNT层的存在显著抑制了两种离子跨界面的转移，对PF离子具有更高的选择性。这种效应既归因于SWCNT对界面的部分阻塞，也归因于背景电解质离子在SWCNT表面的电位依赖性吸附，这已通过X射线光电子能谱得到证实，其是由界面SWCNT与转移离子之间的静电相互作用引起的。
